- 行业: Weather
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The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
Apparatus used for the electrical transmission of a graphic or printed record, for example, a weather map or a letter, usually over telephone wires but occasionally by radio. The received image is built up from dots or lines that may be of constant intensity or of varying intensity, depending on the type of system employed. See pixel.
Industry:Weather
The use of digital or electrical methods in radar to eliminate or reject the target signals from all targets that are outside certain range limits. Such methods make it possible to measure properties of the echoes from particular targets without interference from the signals returned from closer or more distant targets.
Industry:Weather
In meteorology, any display form of weather information, usually a type of synoptic chart, that has been reproduced by facsimile equipment. Master charts are plotted and analyzed at central weather stations and are transmitted to individual weather stations. Other fields of data are developed by local software from an array of digital data supplied by regional centers. Transmission of weather information by facsimile is rapidly becoming obsolete.
Industry:Weather
Electromagnetic radiation originating from transitions between energy levels of atomic nuclei. A nucleus formed as a consequence of beta or alpha emission sometimes exists briefly in an excited energy level and makes a transition to a lower energy level accompanied by emission of a gamma ray photon with energy equal to the difference between the energies of the initial and final levels. Gamma ray energies from radioactive decay lie in the approximate range 10 keV–6 MeV. Gamma rays are also emitted in nuclear reactions. The boundary between x-rays and gamma rays is fuzzy, the latter term being most often used for electromagnetic radiation of nuclear origin.
Industry:Weather
The use of digital or electrical methods in radar to eliminate or reject the target signals from all targets that are outside certain range limits. Such methods make it possible to measure properties of the echoes from particular targets without interference from the signals returned from closer or more distant targets.
Industry:Weather
A shallow gravity wind, along the icy surface of a glacier, caused by the temperature difference between the air in contact with the glacier and free air at the same altitude. The glacier wind does not reverse itself diurnally as do mountain and valley winds, but it reaches its maximum intensity in the early afternoon. The glacier wind is characterized by strongly turbulent flow. See katabatic wind.
Industry:Weather
A shallow gravity wind, along the icy surface of a glacier, caused by the temperature difference between the air in contact with the glacier and free air at the same altitude. The glacier wind does not reverse itself diurnally as do mountain and valley winds, but it reaches its maximum intensity in the early afternoon. The glacier wind is characterized by strongly turbulent flow. See katabatic wind.
Industry:Weather
A type of semipermanent anticyclone that has been said to overlie the ice caps of Greenland and Antarctica. As presented by W. H. Hobbs, it was thought that these anticyclones played a dominant part in the world atmospheric circulation, but modern theory backed by limited observation has tended to diminish their importance and even to question their reality. See thermal high.
Industry:Weather
A type of semipermanent anticyclone that has been said to overlie the ice caps of Greenland and Antarctica. As presented by W. H. Hobbs, it was thought that these anticyclones played a dominant part in the world atmospheric circulation, but modern theory backed by limited observation has tended to diminish their importance and even to question their reality. See thermal high.
Industry:Weather
A cyclone, or low, that appears to have formed or developed in the vicinity of the Gulf of Genoa (Ligurian Sea).
Industry:Weather
